<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>

      <!-- 角色列表区域 -->
      <el-table :data="rolesList" stripe border>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row :class="['bdbottom', index1 === 0 ? 'bdtob' : '', 'vcenter']" v-for="(item1, index1) in scope.row.children" :key="item1.id">
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row, item1.id)">{{ item1.authName }}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 渲染二级权限 -->
                <el-row :class="[index2 === 0 ? '' : 'bdtob', 'vcenter']" v-for="(item2, index2) in item1.children" :key="item2.id">
                  <el-col :span="6">
                    <el-tag type="success"
                    closable @close="removeRightById(scope.row, item2.id)">
                    {{ item2.authName }}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag type="warning" v-for="(item3) in item2.children" :key="item3.id"
                    closable @close="removeRightById(scope.row, item3.id)">
                    {{ item3.authName }}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index" label="序号"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作">
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
            <el-button size="mini" type="warning" icon="el-icon-setting"
            @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="30%"
      @close="setRightDialogClosed">
      <el-tree
      :data="rightsList"
      :default-checked-keys="defKeys"
      :props="treeProps"
      show-checkbox
      default-expand-all
      node-key="id"
      ref="treeRef"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 所有角色权限列表
      rolesList: [],
      // 控制分配权限对话框显示与隐藏
      setRightDialogVisible: false,
      // 所有权限的数据
      rightsList: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的节点id值数组
      defKeys: [],
      // 当前即将分配权限的角色id
      roleId: ''
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    // 获取用户权限列表
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status === '200') {
        return this.$message.error('获取角色列表失败！！！')
      }
      this.rolesList = res.data
    },

    // 根据id删除权限
    async removeRightById(role, rightId) {
      const confirmResult = await this.$confirm('此操作将永久删除该权限，是否继续？', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(error => error)
      // 点击取消按钮
      if (confirmResult !== 'confirm') {
        return this.$message.info('已经取消了删除操作')
      }
      // 确认删除
      console.log('已经删除该权限')
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      // 将删除某一项权限后的权限组合重新赋值给当前用户的children,
      // 便可以在不跳转页面的情况下查看删除后的效果
      role.children = res.data
    },

    // 分配权限
    async showSetRightDialog(role) {
      // 保存用户的id
      this.roleId = role.id
      // 获取所有权限数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败！！！')
      }
      this.rightsList = res.data
      this.getLeafKefs(role, this.defKeys)
      // 显示分配权限对话框
      this.setRightDialogVisible = true
    },

    // 通过递归的形式，获取角色下所有三级权限的id,并保存到degKeys数组中
    getLeafKefs(node, arr) {
      // 如果当前节点不包含children属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item => this.getLeafKefs(item, arr))
    },

    // 监听分配权限对话框的关闭事件
    setRightDialogClosed() {
      this.defKeys = []
    },

    // 分配权限函数
    async allotRights() {
      // 所有选中和半选状态的节点对应的id
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      // 分配权限失败
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败！')
      }
      // 分配权限成功
      this.$message.success('分配权限成功！')
      // 刷新角色权限列表
      this.getRolesList()
      // 关闭对话框
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
  .el-tag {
    margin: 7px;
  }

  .bdtob {
    border-top: 1px solid #eee;
  }

  .bdbottom {
    border-bottom: 1px solid #eee;
  }

  .vcenter {
    display: flex;
    align-items: center;
  }
</style>
